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Note 3 - Revenue - Disaggregation of Revenue by Major Categories and Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 88,982	$ 99,298	$ 266,467	$ 304,487
UNITED STATES
Net sales	63,292	69,491	188,312	211,976
Non-US [Member]
Net sales	25,690	29,807	78,155	92,511
Pumps and Pump Systems [Member]
Net sales	77,035	86,114	230,581	260,913
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 11,947	$ 13,184	$ 35,886	$ 43,574

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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